Combo Boxes gives "Loading failed" after upgrade from 0.90.3 to 9.1.3

Hello all,

After we upgraded our test environment to the new version, all combo boxes with queries (and not predefined data) have the same error: "Loading failed"

Strange is that if i want to add a user as watcher, the combo box is searching and finds only 50 users. If i scroll down to load more, it will display after loading, the same users.If a choose group, then "Loading failed" appears.

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